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    <title>Document</title>
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    <script>
      var arr = [1, 2, undefined, "undefined", 3, "3", 4, 4, false, "false", null, "null", 0];
      //搭配拓展运算符
      var newArr = [...new Set(arr)];
      console.log(newArr);
      //使用数组from方法将set转数组
      //   console.log(Array.from(new Set(arr)));
    </script>
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